I have no idea how the classification of these work, but yes i was, atleast in my mind, referring to that glock since in the vid he sais it takes glock mags.

Well up to 50m, a well trained person with pistols has no problem emptying a pistol real quick with a spread of few cm. During practical shooting (im a member of the International Practical Shooting Club, i think ) some modified pistols fire so fast it is impossible to tell without physically seeing the pistol if it is single shot or full auto.

Personally my amateur opinion is that if it is originally designed to be shouldered, it's an smg. that popup pistol is still a pistol fitted inside a case. F*** if i know .

EDIT: Well we can also look at it this way that they are designed for different range. If one fits a pistol with a stock it wont give much range because the aiming mechanism of a pistol doesn't count in the bullet drop off trajectory, wheres an smg, which originates from a rifle is designed to combat at a longer range.

and then there's the broom-handle mauser

It looks kinda like a pistol, but if fires rifle ammunition. And it has an optional stock. So wtf, is it a rifle or a pistol? BTW, I've fired one of these and it's freakin' awesome.

I think it is still a pistol, kinda like the desert eagle which fires cannon balls. The stock on that thing is a joke anyway, it must weigh a friggin ton.

yea, I didn't fire it with a stock. No clue how that works. It was a lot of fun firing though, even though the stripper clip thing is kinda weird (the magazine being non-removable). I need to go shooting again... I haven't been in a really long time.